Sometimes my horse picks up the wrong lead but I can't usually tell so someone else does for me. How can I be able to tell if he is on the right lead or not while on him and how can I get him to always pick up the right lead?
You need to set him up properly for the lead, using the cue your trainer recommends, or by bending him around your leg, and lifting your inside hand, or by turning him as you ask for the lope.
To tell, you can cheat by looking down at his legs and seeing with is farther in front as he strides--that's the lead he's on. It will also be smoother when he is on the correct lead. Or if you feel the direction that your belly button is being pulled with each stride--that is also the lead he's on.